diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index 5a57448..8028b67 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -50,12 +50,12 @@ THE SOFTWARE.
 #    define CXXOPTS_NO_REGEX true
 #  endif
 #endif
-#if defined(_MSC_VER)
-#define CXXOPTS_LINKONCE_CONST	__declspec(selectany)
-#define CXXOPTS_LINKONCE		__declspec(selectany)
+#if defined(_MSC_VER) && !defined(__clang__)
+#define CXXOPTS_LINKONCE_CONST	__declspec(selectany) extern
+#define CXXOPTS_LINKONCE		__declspec(selectany) extern
 #else
-#define CXXOPTS_LINKONCE_CONST	const
-#define CXXOPTS_LINKONCE
+#define CXXOPTS_LINKONCE_CONST	
+#define CXXOPTS_LINKONCE		
 #endif
 
 #ifndef CXXOPTS_NO_REGEX